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Audio and Video
Audio and Video
Overview
Overview
The Medium
The Medium
Streaming Media
Streaming Media
UDP and RTSP
UDP and RTSP
Codecs
Codecs
Popular Formats
Popular Formats
RealMedia
RealMedia
QuickTime
QuickTime
Various Formats
Various Formats
General Design Guidelines
General Design Guidelines
Video Guidelines
Video Guidelines
Audio Guidelines
Audio Guidelines
Library of Congress
Library of Congress
Video Content
Video Content
Audio Content
Audio Content
IA and Audio / Video
IA and Audio / Video
References
References

Презентация на тему: «Audio and Video». Автор: Joseph Subversion. Файл: «Audio and Video.ppt». Размер zip-архива: 387 КБ.

Audio and Video

содержание презентации «Audio and Video.ppt»
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1 Audio and Video

Audio and Video

Curtis Thomas 385E Information Architecture and Design I

2 Overview

Overview

The Medium Popular Formats Design Guidelines Library of Congress Analysis IA and Audio / Video

3 The Medium

The Medium

Streaming Media Codecs

4 Streaming Media

Streaming Media

Streaming media was made possible by the creation of two protocols: User Datagram Protocol (UDP) RealTime Streaming Protocol (RTSP)

5 UDP and RTSP

UDP and RTSP

Continuously send information even when data dropout occurs Users get information in chunks Network congestion can cause a lapse in the video or audio feed

6 Codecs

Codecs

Transform data streams by discarding any unnecessary data Audio codecs discard frequencies that fall outside of the range of human hearing Video codecs predict picture content from previously viewed images in the stream

7 Popular Formats

Popular Formats

RealMedia Apple’s QuickTime MPEG, MP3, WAV

8 RealMedia

RealMedia

RealMedia is a streaming audio and video format Useful for slower Internet connections Reduced audio quality Slower video playback (3 to 6 fps) Heavily affected by Internet traffic

9 QuickTime

QuickTime

Offers a streaming format as well as smaller downloadable files Higher quality streaming format than RealMedia Average file size is 5 to 6 megs per minute of video Greater bandwidth demands

10 Various Formats

Various Formats

MPEG (Video) High quality 9 megs per minute of video MP3 (Audio) High quality, fast downloads WAV (Audio) Highest audio quality Longer download times Must wait for download to finish completely

11 General Design Guidelines

General Design Guidelines

Inform users of technological demands Provide clear access to software Avoid gratuitous “eye candy” Stick with standard formats Provide controls

12 Video Guidelines

Video Guidelines

Plain page summary Screenshots from video content Segment long clips Choose clips with minimal motion

13 Audio Guidelines

Audio Guidelines

Summarize content Give users control Provide estimated download times

14 Library of Congress

Library of Congress

American Memory Website

15 Video Content

Video Content

16 Audio Content

Audio Content

17 IA and Audio / Video

IA and Audio / Video

The key to successful Web multimedia is to tailor your content for Web delivery. Do not simply translate video and audio content to the computer screen. Employ design guidelines and use the strength of computers to make content exciting and approachable.

18 References

References

American Memory from the Library of Congress, Retrieved on October 20, 2004 from: http://memory.loc.gov/ammem/index.html Beggs, J. and Thede D. (2001). Designing Web Audio: Chapter 5: Introduction to Streaming Media. Retrieved October on 22, 2004 from: http://www.oreilly.com/catalog/sound/chapter/ch05.html Nielsen, J. (1999). Video and Streaming Media. Retrieved on October 22, 2004 from: http://www.useit.com/alertbox/990808.html Streaming media – Wikipedia, Retrieved on October 22, 2004 from: http://en.wikipedia.org/wiki/Streaming_media Codec – Wikipedia, Retrieved on October 20, 2004 from: http://en.wikipedia.org/wiki/Codec QuickTime – Wikipedia, Retrieved on October 20, 2004 from: http://en.wikipedia.org/wiki/QuickTime Windows Media – Wikipedia, Retrieved on October 20, 2004 from: http://en.wikipedia.org/wiki/Windows_Media Windows Media Audio – Wikipedia, Retrieved on October 20, 2004 from: http://en.wikipedia.org/wiki/Windows_Media_Audio Windows Media Video – Wikipedia, Retrieved on October 20, 2004 from: http://en.wikipedia.org/wiki/Windows_Media_Audio

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